從輸入數組中減去數字

Question

我對Python很陌生，試圖弄清楚如何減去用戶輸入數組中的數字。例如，早在我的計劃，我有： `

peakone = raw_input("Where is the next large peak?: ") 
next_peak.append(peakone) 
peaktwo = raw_input("Where is the next large peak?: ") 
next_peak.append(peaktwo) 

現在我想從peaktwo減去peakone並保存此值作爲第三。如果有，最好的辦法是什麼？

Answer 1

你可以這樣說：

peakthree = float(peaktwo) - float(peakone) 

你從raw_input得到的是一個字符串，所以你需要將其轉換爲數字類型，像float或int。如果需要的話

def get_next_peak(): 
    return float(raw_input("Where is the next large peak?: ")) 

next_peak = [] 
next_peak.append(get_next_peak()) 
next_peak.append(get_next_peak()) 
next_peak.append(next_peak[1] - next_peak[0]) 

Answer 2

設置輸入next_peak爲list

演員到int或float

next_peak = [] 
peakone = raw_input("Where is the next large peak?: ") 
next_peak.append(int(peakone)) 
peaktwo = raw_input("Where is the next large peak?: ") 
next_peak.append(int(peaktwo)) 
print next_peak[0] - next_peak[1] 

可以改變int到float